/ Dictionary / Index E embryonic: Meaning and Definition of Find definitions for: em•bry•on•ic Pronunciation: (em"brē-on'ik), [key] — adj. pertaining to or in the state of an embryo. rudimentary; undeveloped. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: embryonic (Thesaurus) embryology embryonic disk Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language